Process for finishing artificial thread



Patented July 27, 1937 .This invention artificial thread. tion relatesto the from cellulosic solutions such as viscose.

more particularly,

improvement in the handling and` regenerated cellulose threads.

In the method 2,087,940 4 :rnocEss Foa rINIsmNG ARTIFICIAL THREADCharles Chatin, Izieux, France, assigner, bymesne assignments,

Delaware! to E. I. du Pont de Nemours 8s Company, Wilmington, Del.,

a* corporation of Application october zz, 1931, semina. 510,474

In France October 22, 1930 l 1l Claims.

relates to the production of More particularly, this invenproduction ofartificial thread Still the invention relates to an purifying of ofmaking artificial thread wherein a solution of cellulosic material isable thickness 10 formed into threads and woundto a consideron a rigidbobbin and wherein thethread is subsequently puried and dried on thebobbin, the outer windings of thread, laid on the compressible underwindings, 15 considerably in 'the purification and drying,

which are shrink whereas the windings close to the rigid core areprevented from shrinking. This causes the finished thread to have unevendenier, varying strength, and dyeing characteristicsl which are notuniform. In

the past it has been found,

20 desirable to take the spunV thread from the bobbin and reel it intoloose or to'spin it onto non-rigid bobbins. These tion,

skeinsV before purificaprocesses have not been entirely satisfactory,

however, because,

25 acquires broken filaments, knots,

or broken threads the first process the yarn kinks and cut throughhandling, and in the second processl imperfect equalization andpurification result.

It is an object 30 the manufacture of r the invention to of thisinvention to improve of rayon.

It is another object improve the handling and purication of rayonthreads of the regenerated cellulose type which have been spun onbobbins. 35 Other objects of the invention will be in part apparent andin part set forth as the description proceeds.

These objects are accomplished 'by winding' purification. upon a bobbin.rewinding with twistsecond bobbin .which is preferably provided with aliquid-permeable, collapsible, removable core, and re- \mo,ving thewound cake from the vbobbin before treating.

In the accompanying drawing, Figure 1 is an `elevation showing therewinding; with one form of Figures 2 and collapsible covering; Figures3 one method of accomplishing 2a show a bobbin and 4 show a bobbin witha collapsible covering used to protect a wound cake of rayon; Figure. 5villustrates one method of arranging the second bobbin for windingl v *lIn Figure 1, numeral I indicates a bobbin;

2 is a cake of ray on wound upon the bobbin; 3

d; 4 is a guide for the rayon bead, Aor with a bead of size insumcientto prevent the easy withdrawal of the rewound cake;

I0 is a collapsible covering consisting in this instance of a clothhaving projecting ends which may be tucked inside the bobbin (as inFigure 3) during winding.

In Figure 3. numeral 2l is rayon which may be provided, as shown, squareends, or with bevelled ends.

In Figure 4, the cloth covering i0 has' been Withdrawn from the interiorof the bobbin 8 and folded in protecting position over the outside ofthe cake. After the cake has been thus protected, it will be slipped offthe bobbin, as indicated in dotted lines. and processed.

-In Figure 5, numeral 9 indicates generally the rewinding frame whichcomprises two wheeliike ends connected 'by an axle, 92,1which ispreferably integral with one of the wheel-like ends but not with theother; 93 is a nut on the end of the axle, by means of which the rewindbobbin may be clamped between the wheels of the frame.- In operationthese wheels run upon and are driven by the surface of roller 9| asshown'in Figure l. y

In the practice of this invention the threadmay be either in the gel orin the dried state.

A gel thread is one that has not been dried to equilibrium after beingformed. A dri-ed thread is one that has been brought to its equilibriumor standard moisture content. i

A cloth -covering for the rewind bobbin has been illustrated in thedrawing. but coverings of ,other materials. such as suitable paper. orcardboard coverings, may be used and, since they collapse in thepurifying liquid, need not be removed before purification.

An advantage of my invention is an improvement in the quality of theyarn produced, as. compared with customary methods. This imy proveme'ntappears yparticularly in the increased uniformity of the thread and inits improved and more'l uniform dyeing properties. Yet anotheradvantages lies in the improved meQiod of han- I a rewound cake of withdling. Other advantages will be apparent to those skilled in the art.

As many apparently widely different embodiments of this invention may bemade Without departing from the spirit and lscope thereof, it is to beunderstood vthat I do not limit myself to the specific embodimentsthereof except as defined in the appended claims.

I claim:

1. In the manufacture of rayon, the process which comprises spinningrayon in cake form upon a. bobbin rewinding with twisting into cake formupon a second bobbin, and removing the cake from the second bobbinbefore purifying the cake.

2. In the manufacture of rayon, the process which comprises spinning thethread upon a` bobbin, re-winding with twisting upon a second bobbinhaving a permeable collapsible covering capable of being placed 4inposition to protect the cake, removing the cake and covering from thebobbin, and purifying it.

3. In the manufacture of rayon, the process which comprises spinning thethread upon a bobbin, re-winding with twisting upon a second bobbinhaving a clothl covering, folding the cloth overthe wound cake, removingthe cake from the bobbin, and purifying it.

4. In the manufacture of rayon, the process which comprises spinning thethread in the gel state upon a bobbin, re-winding the gel thread withtwisting upon a second bobbin having a cloth covering, folding the clothover the wound cake. removing the cake from the bobbin, and purifyingit.

5. In a method of treating spun filaments, the steps of spinning thefilaments on a bobbin, rewinding and twisting the filaments onto asecond supporting means, removing the filaments in the form of a. cakefrom this second support,

and wet treating the said cake.

- 6. In a method of treating spun filaments, the steps of spinning thefilaments on a bobbin, rewinding and twisting the filaments onto asecond supporting means, said means being covered with va covering priorto the rewinding of the filaments thereon, removing the filaments in theform of a cake from this second support, and wet treating the said cake,said covering acting to keep the filaments from tangling or knotting.

'7. In a process of the class set forth, the steps of drying spool-spunfilaments, rewinding and twisting them onto a second support, removingthe filament body soformed, as a unit, and subjecting this body toaftertreatment and drying while in an unsupported state.

8. In a process of the class set forth, the steps of drying spool-spunvfilaments, rewinding them onto a second support to form a filament bodycomprising a tightly Wound cake, removing the filament body so formed,as a unit, and subjecting this body to aftertreatment and drying Whilein an unsupported state.

9..In a process of the type descrid, the steps of spool spinning anddrying filame ts, rewinding the yarn into a tight cake onto secondsupporting means from which the cake may be removed bodily, removing thecake bodily and then Wet treating and drying it while it is in anunsupported condition.

10. In the production of even shrinkage yarn, the steps of spinningfilaments on a bobbin, rewinding onto secondary supports, removing thefilaments bodily from said secondary supports, and wet treating anddrying them unsupported.

11. In the manufacture of rayon the vprocess which comprises spinningrayon onto a bobbin, withdrawing the rayon while rotating the bobbin andrewinding the rayon onto a second bobbin before purifying the rayon.

CHARLES CHATIN.

